Difference Between Algae and Protozoa

The cell wall of algae is made up of a substance called cellulose. Spore is the resting unit of algae. Some examples of algae are cyanobacteria, brown algae, Seaweeds, red algae, green algae.

Protozoa are prokaryotic organisms, i.e., single-celled animals. Protozoa are prokaryotic organisms belonging to the Protista kingdom. Protozoa are organisms possessing animal-like characteristics.

Comparison Table Between Algae and Protozoa

Parameters of ComparisonAlgaeProtozoa
CellsMulticellular/Eukaryotic; some are single-celled too.Single-celled/Prokaryotic; some are multicellular too.
DefinitionAlgae are non-flowering, small, aquatic plants having a green pigment called chlorophyll in them. They lack root, true stem, vascular system and leaves.Protozoa are prokaryotic organisms belonging to the Protista kingdom.
CharacteristicsAlgae are organisms possessing plant-like characteristics.Protozoa are organisms possessing animal-like characteristics.
Method Of obtaining EnergyAlgae make their own food. Hence they are autotrophs. Protozoa are not capable of making their own food. Hence they are heterotrophs.
SignificancePhotosynthesisPhagocytosis
ChlorophyllChlorophyll is present.Chlorophyll is absent.
Cell WallThe cell wall of algae is made up of a substance called cellulose.The cell wall is absent.
Resting UnitSporecyst
ExamplesCyanobacteria, brown algae, Seaweeds, red algae, green algae. Euglena, Amoeba, Entamoeba histolytica, Paramecium, Leishmania.
In humansAlgae produce toxic chemicals which are really hazardous to humans.Protozoa are capable of causing diseases in humans such as malaria by plasmodium.
ImportanceAround 70% of oxygen is produced by algae in the atmosphere.Most aquatic food chains depend upon protozoa as their foundation.

What is Algae?

Algae are generally microscopic, which are unicellular. These types of unicellular Protozoa are called microalgae. In contrast, the types of multicellular protozoa are called macroalgae.

Algae are multicellular organisms or eukaryotic organisms. Algae are non-flowering, small aquatic plants having a green pigment called chlorophyll in them. They lack root, true stem, vascular system and leaves.

Algae

What is Protozoa?

Protozoa are generally free-living organisms. However, sometimes they infect higher-order animals as well. As they lack a cell wall, thus they possess a variety of shapes.

Chlorophyll is absent in protozoa. The cell wall is absent in protozoa. A cyst is the resting unit of protozoa. Some examples of protozoa are Euglena, Amoeba, Entamoeba histolytica, Paramecium, Leishmania. Some protozoa are capable of causing diseases in humans, such as malaria by plasmodium.

Main Differences Between Algae and Protozoa

  1. Algae produce toxic chemicals which are hazardous to humans. Whereas some protozoa are capable of causing diseases in humans, such as malaria by plasmodium.
  2. Around 70% of oxygen is produced by algae in the atmosphere. Whereas most aquatic food chains depend upon protozoa as their foundation.
Difference Between Algae and Protozoa

Conclusion

Algae and protozoa are two kinds of millions and billions of organisms, both belonging to the kingdom Protista. Algae are either multicellular or unicellular and are plant-like organisms.

In comparison, protozoa are eukaryotic organisms having the animal characteristic. Thus, the main difference between algae and protozoa is the way they prepare and eat food, i.e., their mode of nutrition.

By the process of photosynthesis, algae produce foods. Whereas by the process of phagocytosis, protozoa engulf food.

References

  1. https://www.annualreviews.org/doi/pdf/10.1146/annurev.mi.10.100156.001515
  2. https://www.annualreviews.org/doi/pdf/10.1146/annurev.mi.12.100158.001431
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